Usage of "p." vs "pp." to denote two separate pages

Solution 1:

While this issue may be covered in style guides, I would suggest, absent any clear convention to which to defer, that the choice might be situational.

If you are referencing separate items, though both may directly support your particular content, that have no strong relation to each other more so than expected by appearing in nearby pages, then you might choose the first option, to emphasize the distinctness of the references.

Alternatively, if the two pages include a continuation of the same reference, such as consecutively-numbered diagrams that are placed on non-consecutive pages for typographic considerations, then you might choose the second option, to emphasize the continuity of the sequence.